Added UMA stats to overview mode

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 2cb8740a3307b6a262801375dcc437ec0de9b5b0..d373a03d8b7821ac80cb59e563e55d2fa7aa65d3 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -682,7 +682,7 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
-<histogram name="Ash.WindowSelector.CycleTime" units="milliseconds">
+<histogram name="Ash.WindowCycleController.CycleTime" units="milliseconds">
   <owner>flackr@chromium.org</owner>
   <owner>kuscher@google.com</owner>
   <summary>
@@ -691,23 +691,45 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Ash.WindowSelector.ArrowKeyPresses">
+  <owner>flackr@chromium.org</owner>
+  <owner>tdanderson@chromium.org</owner>

[tdanderson, 2014/06/09 17:50:46]

Get Rob's feedback on this, but I suspect you'll want the owners of these to be
Rob and Kuscher (not me).

[Nina, 2014/06/09 18:12:51]

Rob was the one that suggested adding you. I'm sorry you're gonna be blamed if
this fails :)

+  <summary>
+    The number of times the arrow keys are pressed in overview mode. This is
+    only measured for the sessions that end by selecting a window with the enter
+    key.

[tdanderson, 2014/06/09 17:50:46]

Specify that the count recorded represents the number of arrow key presses in a
single OM session.

[Nina, 2014/06/09 18:12:50]

Done.

+  </summary>
+</histogram>
+
 <histogram name="Ash.WindowSelector.Items">
   <owner>flackr@chromium.org</owner>
   <owner>kuscher@google.com</owner>
   <summary>
     The number of items (single windows or groups of windows such as panels) in
-    the window selection. Window selection occurs when a user begins alt-tabbing
-    or presses the overview button (F5 key).
+    the overview mode.

[tdanderson, 2014/06/09 17:50:46]

Specify that it's recorded as the number of items that are present at the start
of each session.

[Nina, 2014/06/09 18:12:50]

Done.

   </summary>
 </histogram>
 
+<histogram name="Ash.WindowSelector.KeyPressesOverItemsRatio">
+  <owner>flackr@chromium.org</owner>
+  <owner>tdanderson@chromium.org</owner>
+  <summary>
+    The ratio between the arrow key presses and the number of overview items,
+    expressed as a percentage.

[tdanderson, 2014/06/09 17:50:46]

for a single OM session

[Nina, 2014/06/09 18:12:50]

Done.

+  </summary>
+</histogram>
+
+<histogram name="Ash.WindowSelector.OverviewClosedItems">
+  <owner>flackr@chromium.org</owner>
+  <owner>tdanderson@chromium.org</owner>
+  <summary>The number of items closed from the window overview.</summary>

[tdanderson, 2014/06/09 17:50:46]

for a single OM session

[Nina, 2014/06/09 18:12:51]

Done.

+</histogram>
+
 <histogram name="Ash.WindowSelector.TimeBetweenUse" units="milliseconds">
   <owner>flackr@chromium.org</owner>
   <owner>kuscher@google.com</owner>
   <summary>
-    The amount of time between uses of window selection to switch between
-    windows. Window selection is entered by alt-tabbing or by pressing the
-    overview button (F5 key).
+    The amount of time between uses of overview mode to switch between windows.
   </summary>
 </histogram>
 
@@ -715,11 +737,10 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <owner>flackr@chromium.org</owner>
   <owner>kuscher@google.com</owner>
   <summary>
-    The amount of time spent in overview mode. Overview mode is engaged when
-    lingering on a window while alt-tabbing or by pressing the overview button.
-    The time is measured from the moment the windows begin animating to a
-    thumbnail size preview to when a window is selected or selection is
-    canceled.
+    The amount of time spent in overview mode. Overview mode is engaged by
+    pressing the overview button. The time is measured from the moment the
+    windows begin animating to a thumbnail size preview to when a window is
+    selected or selection is canceled.
   </summary>
 </histogram>